Hello,

To get admission in IIT you have to go through  first the entrance exams. You will have to clear jee mains and advanced to get seat in any of the IIT's. The cut off for IIT's varies every year depending on various factors. but on a general basis you have to be under 10,000 rank to get a seat in TOP IITS and under 15000-16000 to get admission in any IIT. for the more detailed information regarding the cut off of IIT's you can go through the link provided below:

https://engineering.careers360.com/articles/jee-advanced-cutoff

Hope this helps you

Thank You!